Means for ventilating drying ovens



Apr.. 17, 1923. n 1,451,883

A. MAEHLER MEANS FOR VENTILATING DRYING OVENS Filed July 19, 1922 2 sheetssheet 1 Juv..

uw f-'F om Apr. 17, 1923.

/\.'hdl\E}1LJEF2 MEANS FOR VENTILATING DRYING OVENS` Filed July 19, 1922 2 Sheets-Sheet 5% Patented i?, i923.

hetii v:BLR-TEUR MAEELER, OF CHICAGO, ILLINOIS.

IEEANS FOR VENTILATING DRYNG OVENS.

Application led July 19, 1922. Serial No. 576,656.

To all eli/0m t may concern.'

Be it lrnoivn that L ARTI-Inn MAEHLER, a citizen of the United States of America, residingat (hicago, in the county of Cook and State of illinois, have invented a certain neu7 and useful Improvement in Means for Ventilating Drying Ovens, of which the following is a specification.

rlhis invention relates to that class of internally heated drying and enameling ovens in which means are provided for a circulation through and removed from the oven chamber of thecontaincd air mixed with vapors generated in an operation of the oven.

The present improvement. has for its object. to provide a structural formation and combination of the ventilation parts and features, by which an effective ventilation of the oven chamber is attained, and with which the removal of the heated air lcharged with vapor generatedjin the operation of the oven, can be changed from one portion to another of the oven chamber at the will of the operator, Without any varying or excessive load being imposed on the motor by which the airmoving means is impelled. lith the construction a much smaller motor is needed than that used with ordinary systems of ventilation in drying and enameling ovens, with the attainment of very ef- V'eotire results and iu an economical manner1 all as will hereinafti-n' more fully appear.

in the accompanying dravvingz- Fig. l, is a longitudinal sectional elevation on line l--l. Fig. 2, of a drying and enameling oven embodying the invention.

Fig. Q. is a transverse section on line 2 2,

` Fig. l, illustrating the use of a gas heating means.

Fig. 3, is a fragmentary transverse section illustrating the use of an electric heating means. y

Like reference numerals indicate like parts inthe diiferent views.

Referring to the drawings, l designates the roof portion2 designate the end' Walls, and 3 designate the side Walls of the oven casing or housing, of any usual detail construction .and adapted to provide a closed operating chamber,A preferably of a rectangular shape astshown. y

i designate heaters, Which may be ofthe ordinary tubular gas fired type illustrated in Fig. 2.or the electric heater type illustrated in Fig. 3, which are arranged adjacent to and parallel With the side Walls 3 of the oven7 and preferably in spaced rela-tion to said Walls as shown in Figs. 2 and 3.

5 designate counterpart pairs of inlet ducts arranged between the heaters 4 and the oven side Walls 8. Each inlet duct is of an L or angular form. having a horizontal branch 5, as shown in liligs` l a nd 2. or 5 as shown in Figure 3 extending' out through an oven end Wall 2, and a vertical branch 5 extending upwards between the heater 4 and a side wall 3 to near the top of the oven chamber and opening horizontally into the same. In the preferred construction shown in Fig. l. the` vertical branches 5 are in spaced relation to each other in order to attain a. discharge of the incoming air, into the oven chamber adjacent to the upper four corners of the same. The air passing through the ducts 5 being exposed to a preheating operation from the adjacent heaters et. i

6 designates a pair of outlet ducts for the mixed vapor and heated air of the oven chamber. Each of said ducts is of an L or angular form, having a vertically arranged branch 6 arranged adjacent to an end Wall 2 of the oven and opening into the bottom portion of the oven chamber` and, ahorizontal branch 6 arranged adjacent to the oven roof 1 and extending to the ycenter ot the oven for connection in common with a companion branch 6.'A of the other outlet duct. to a vertical trunk 7 arranged centrally in the oven roof l and having connection with the intake end of an exhaust fan nonY to be described.

8 designates .an exhaust fan, preferablv arranged above the oven roof7 with its in take connected to the aforesaid trunk 7 and associated outletducts 6.l The outlet or discharge of the fan 8 is connected to a pipe or conductor 9 which extends a distance up` Wardly into a tubular stack 10, said stack in turnextending to the outer atmosphere or to the smoke stack of the building. ln

the present improvement the lower end of the tubularV stack 10 has a closed formation and iis-provided with a supplementary connection. With the top portion `of the .oven chamber by means as follows 1,1 designates ducts having connection with the lowerend ofthe stack 10, atopposite sides of the same, l and Aexteiiding down through thenoven` roof l to have communica tion with the upper portion ofv the ovenV chamber.

(ill

fee-ted by means as follows 12 designates dampers, preferably of the swinging type shown, arranged in the ducts ll, with their pivot shafts carrying crank arms 18 exterior of the walls yof said chiots, and connected'together by a push and pull rod 14, convenient off access on the part of the operator, and adapted to eiiect a simule taneous opening and closingof the valves or dampers.

Havinggthus fully described my invention, what l claim as new and desire to secure by Letters Patent, is 1- 1.111 an oven of the type describeffl` the combination. of a closed oven casing7 heating means arranged in said casing, an inlet duct for introducing air into the upper portion of the interior of said casing, an outlet duct adapted to take air from the lower portion of the interior of said casing, an exhaust fan having its intake connected with said outlet duct, a hollow stack closed at its lower end, a pipe arranged within the lower end of said stack and connected with the outlet of the fan, a duct connected to said stack at one end and at the other end to the upper portion of theA` interiorot' the casing, and a damper arranged in said duct.l

2. In an oven of the type described, the combination of a closed oven casing. heating means arranged at the respective sides of the interior of said casing` a plurality of inlet ducts having vertical branches arranged intermediate of the heaters and the side walls of the casing and adapted to introduce air into the upper portion of they interior of the casing, a plurality of outlet ducts arranged at the respective ends of the casing and adapted to take air from the lower portion of the interior of the casing7 an exhaust fanv having its intake `connected to the outlet ducts by a vertical trunk common to both outlet ducts, a. hollow stack closed at its lower end7 va pipe arranged in the klower endetl saild staclr and connected to the outlet of .the fan, a plurality of supplementary outlet. ducts connected at one end to the lower end of. said stack and at the other end with the upper portion of the interior ofthe casing, and dempers arranged in said outlet ducts.

`3. vIn 'an ovenfof `the. `type described,- the' combination of closed oven casing, heating means arranged at the respective sides ,ot the interior of said casing, a plurality of inlet ducts having vertical branches arranged intermediate of the heaters and the side walls of the casing and adapted to introduce air into the upper portion of the interior of the casing7 a plurality ot outlet ducts arranged at the respective ends of the casing and adapted to take `air from the lower portion of the interior of the casing, an exhaust fan having its intake connected to the outlet ducts by a vertical trunk common to bothoutlet ducts, a. hollow stack closed at its lower end, a pipe arranged in the lower end of said stack and connected to the outlet of the fan, a plurality of supplementary outlet ducts connected at one end to the lower end of said stack' and at the other end with the upper portion oi the interior of the casing, and dampers ar ranged in said supplementary ducts and connected together for simultaneous operation.

4l. In an oven of the type described, the combination of a closed oven casing7 heating means arranged at the respective sides of the interior of said casing, -counter part pairs of inlet ducts of an L form having vertical branches in longitudinal spaced relation and `adapted to `introduce air into 'the upper portion of the interior of the casing, a plurality of outlet ducts arranged at the respective ends of the casing and adapted to take 4air from the lower portion of the interior of the casing, an exhaust fan having its intake connected to the voutlet ducts by a vertical trunk common to both outlet ducts, a hollow stack closed at its lower end, a pipe arranged in the lower end of said stack and connected to the outlet of the lian, a plurality otsupplementary outlet ducts connected at one end to the lower end of said stack and at the other end .with the upper portion of the interior of the casing, and dampers controlling the outlet ducts.

5. In an oven of the type described, the combination of ay closed oven casing, heating means arranged at the respective sides of the interior of said casing, a plurality of` inlet ducts having vvertical branches arranged intermediate of the heaters and the side walls of the casing Vand adapted to introduce air into the lupper portion of the. interior of the casing, a pluralityvof outlet ducts arranged at. the respective ends of thecasing and adapted to ,take air from the lower portion of: the interior of' the raming,

and an exhaust fan having its intake'connected with the aforesaid'outlet.tiuillrs Signed at Chicago,` Illinoisythis 18thday ofauiy'ieea` o g ARTHUR 

